<template>
  <div class="person">
    <h1>情况1: 监视ref定义的基本类型数据</h1>
    <h2>当前求和为: {{sum}}</h2>
    <button @click="changeSum">点我sum+1</button>
  </div>
</template>

<script setup lang="ts" name="Person">
import {ref, watch} from "vue";

let sum = ref(0)

function changeSum() {
  sum.value += 1
}

const stopWatch = watch(sum, (newValue, oldValue)=>{
  console.log("sum变化了", newValue, oldValue)
  if (newValue >= 10) {
    stopWatch()
  }
})

</script>


<style scoped>
.person {
  background-color: skyblue;
  box-shadow: 0 0 10px;
  border-radius: 10px;
  padding: 20px;
}

button {
  margin: 0 5px;
}
</style>